An acronym for Inter-Language Unification system, one of the most sophisticated Foreign Function Interface generators.

Excerpt from ILU 2.0beta1 Reference Manual, What ILU Does:

ILU is primarily about interfaces between units of program structure; we call these units modules. The notion is that each module enscapsulates some logical part of a program, that has high `cohesiveness' internally, and low `coupling' to other parts of the program. ILU provides you with a way of writing down an object-oriented interface to the module; that is, a set of object types and other types, constants, and exceptions that another module would use to communicate with it. This interface can then be processed by various ILU tools to implement that communication.